Device in ice drills



Feb. 9, 1965 A. LIND 3,168,923

DEvcE 1N ICE nRILLs Filed May 17. 1963 IN VEN TOR.

ders Lind,

Attorney United States Patent Oiltice Patented Feb, 9, l. 965

The present invention refers to a device in ice drills. It is now common practice to make ice drills demonntable so that the crank and drilling rod may be held together and transported as a unit. However, in practice it has hitherto been ditiicult to bring about simple and reliable securing means for connecting the drilling rod and the drilling crank during transport. In most cases the securing means comprise loose clamps which are unscrewed and loosened from the drilling rod as well as from the drilling crank when the ice drill is to be used. The present invention has for its object to provide a simple but effective securing device with no loose parts.

A device according to the invention is chiefly characterized by the feature that the drilling crank is provided with securing means for connecting the drilling rod to the drilling crank during transport, storing or the like, which means comprise a yoke and a hook arranged in such a way that, when the drilling rod is inserted through the yoke and moved to engagement with the hook, the drilling rod will enter into a twisting engagement with the yoke so that the inherent resiliency of the yoke and the drilling rod eoact in holding the drilling rod into engagement with'the hook.

The present invention will be described in greater detail with reference to the annexed drawing, wherein FIG. 1 shows an embodiment of an ice drill or ice bore, to which the present invention is applied, the drilling rod being placed in position for connection to the crank. FIG. 2 shows the drilling rod connected to the drilling crank as seen from the side with the turning handle of the crank directed away from the viewer, and FIG. 3 shows a top plan view of the device as shown in FIG. 2. FIG. 4 is an elevational view of a drilling bit guard and FG. 4a is an end view of a drilling bit guard. FG. 5 is a cross-section along the line S-S in FIG. 3.

The ice drill shown comprises a crank 1 and a drilling rod 2, the right part of FIG. 1 showing by dashed lines how the drilling rod 2 is secured to the crank 1 during use. The crank 1 is provided in the usual way with a top grip 3 and a turning handle d. At the upper crank bend adjacent the top `grip 3 a U-shaped yoke 5 is arranged having its Shanks 6, '7 secured to said crank bend. The yoke 5 forms an inclined angle to the lower part 8 of the crank 1, said part being concentric with the axis of rotation. A hook 9 is mounted on the part 8. The upper part of the drilling rod 2 is formed as a threaded bolt 1li, the lower end of said rod being provided with a cup-shaped drilling tool l1 in the usual way having a semi-circular bit 12. A U-shaped bit guard 13 is mounted on the bit, the two shanks 1d, 15 of the guard being adapted to be pulled together by means of a bracing wire 16 and to engage edge portions 17, 18 which form straight extensions of the bit 12 and which taper towards the drilling rod 2.

When the drilling rod 2 is connected to the crank 1 for transport etc., it is introduced With its bolted end 1@ through the yoke S as shown in FlG. 1, in doing which the cup-shaped drilling tool 11 should be turned in such a way that its concave inside is directed towards the lower end 8 of the crank 1. As seen from FIG. l the yoke is arranged in such a way that when the drilling rod 2 is gnor to Aktie-V swung towards the hook 9, the rod will engage the Shanks f5, 7 of the yoke 5 before it enters into cooperation with the hook 9. ln other words, the drilling rod 2 assumes an inclined position in relationship to the axis of rotation of the drilling crank. When the drilling rod 2 is further swung towards the hook 9, it will twistingly engage the yoke E. When the drilling rod 2 has been swung over the outer end of the hook 9 into engagement with the hook, the inherent resiliency of the yoke as Well as that of the drilling rod will keep the rod clamped between the hook and the yoke.

it is advisable to apply the bit guard 13 to the drilling tool 11, as shown in FIG. l, before the drilling rod 2 is clamped to the crank 1. When swinging the drilling rod 2 in over the hook 9, the lower end 8 of the drilling crank il will engage the bracing wire 16 during the hooking on, in doing which the wire will be tightened at the same time as the drilling rod is moved to its position of engagement with the hook 9, the bit guard thus being secured about the bit 12 of the drilling tool 11. Then the shanks 1d, 15 of the bit guard 13, which are located on the tapering edge portions 17, 1? will also hold the guard 13 into engagement with the bit 12 when tightened.

As shown, a very simple and practical securing device for a drilling rod of a drill crank is provide-d through the present invention without using loose parts.

What is claimed is:

1. A device in ice drills comprising a drilling crank and a drilling rod which are detachably secured to one another, characterized in that the drilling crank is provided with securing means or connecting the drilling rod to the drilling crank during transport, and storage, which means comprise a yoke and a hook arranged in such a way that, when the drilling rod is inserted through the yoke and moved to engagement wtih the hook, the drilling rod will enter into a twisting engagement with the yoke so that the inherent resiliency of the yoke and the drilling rod coact in holding the drilling rod into engagement with the hook.

2. A device in accordance with claim l, characterized in that the yoke is disposed adjacent the upper crank bend, directed obliquely in relation to the axis of rotation of the crank, the hook being adjacent the lower end of the crank on the part concentric with the axis of rotation.

3. A device according to claim 1, further comprising a drilling bit protection device comprising a U-shaped member protecting the bit, the Shanks of said member being adapted to be held together by means of a bracing wire, characterized in that the lower end of the drilling crank is adapted to actuate the bracing wire when the drilling rod is connected to the drilling crank, so that the U-shaped member is secured in protecting position.

4. A device in accordance with claim 3, wherein the drilling rod is provided with a drilling tool having a semicircular bit and wherein said bit merges into two portions tapering towards the drilling rod, characterized in that the shanks of the drilling bit protecting device are adapted to cooperate with said tapering portions.

Reterences Cited hy the Examiner UNITED STATES PATENTS 1,670,982 5/28 Peiter 24-162 2,057,365 10/36 Carlson 175-18 2,554,780 5/51 Goolsbee 175-307 2,694,552 11/54 Vadnais 175-18 3,051,253 8/62 McCann 175-18 3,113,363 12/63 Fyvie 25--257 CHARLES E. OCONNELL, Primary Examiner.

BENJAMN HERSH, Examiner. 

1. A DEVICE IN ICE DRILLS COMPRISING A DRILLING CRANK AND A DRILLING ROD WHICH ARE DETACHABLY SECURED TO ONE ANOTHER, CHARACTERIZED IN THAT THE DRILLING CRANK IS PROVIDED WITH SECURING MEANS FOR CONNECTING THE DRILLING ROD TO THE DRILLING CRANK DURING TRANSPORT, AND STORAGE, WHICH MEANS COMPRISE A YOKE AND A HOOK ARRANGED IN SUCH A WAY THAT, WHEN THE DRILLING ROD IS INSERTED THROUGH THE YOKE AND MOVED TO ENGAGEMENT WITH THE HOOK, THE DRILLING ROD WILL ENTER INTO A TWISTING ENGAGEMENT WITH THE YOKE SO THAT THE INHERENT RESILIENCY OF THE YOKE AND THE DRILLING ROD COACT IN HOLDING THE DRILLING ROD INTO ENGAGEMENT WITH THE HOOK. 